#5. "RE: d7k non nikon lens issues" In response to Reply # 4 Sat 30-Oct-10 12:22 PM by Winterfell
Good to hear that the Bigmos is compatible. Looking forward to pairing the D7000 with that lens.
On my D80, shooting wildlife with the 150-500 OS was always a compromise. At dawn and dusk when the critters are active, getting decent shutter speeds meant cranking up the iso and dealing with grainy washed out colors. I dreaded going beyond ISO 400.
I never had major problems with the autofocus (aside from it hunting when tracking critters that refuse to step out from behind the brush and strike a pose ), but the D7000s autofocus system should help there too. Have you used AF fine tune on that lens? Wondering just how much image quality can be gained from that.
I had the sigma 50 f/1.4 on order with the D7000, but heard of possible autofocus issues with that lens. But that may have been specific to the "must have flawless autofocus during video" cultists. Not a big deal to me personally, but to some this is an important point. AF during video is the big question mark... have you tried your third party lenses with both video and stills?
#8. "RE: d7k non nikon lens issues" In response to Reply # 6
I'm not exactly sure what you're asking. I use autofocus on the Sigma all the time. I haven't tried the AF micro adjust. I'll have to look into that, although I don't really notice any problems with autofocus on this lens.
#9. "RE: d7k non nikon lens issues" In response to Reply # 5
The Sigma 150 - 500 is a compromise. But if you have good light and good technique, it can produce very good images. Dawn and dusk are difficult - I'm looking forward to a bit more usable ISO range for those conditions.
I haven't tried much video yet. I don't know why the AF wouldn't work in video mode. I'll post again if I get a chance.
#10. "RE: d7k non nikon lens issues" In response to Reply # 8 Sun 31-Oct-10 02:50 AM by KnightPhoto
Sorry Ed, I am inquiring about autofocus speed on birds in flight (BIF). There are two aspects - speed and accuracy of initial acquisition and ability to continue tracking accurately as the bird moves across the frame or toward's you?
#11. "RE: d7k non nikon lens issues" In response to Reply # 10 Sun 31-Oct-10 10:33 AM by erosack
The Sigma 150 - 500 is not my first choice for birds in flight. If I know I'm going for in flight photos I usually use the Nikon 70 - 200 VRII.
The Sigma autofocus speed is slower than the 70-200. Accuracy of initial focus is good, but if it misses, it's hard to gain focus after that. Once it locks on, it will track fairly well. And, of course the extra magnification makes aim and panning more difficult.
Some of this depends on which body you're using and how much practice you've had.
All that said, I use it for birds in flight when it's what's on the camera - and it works. A couple of examples (sorry no D7000 yet):
#15. "RE: d7k non nikon lens issues" In response to Reply # 14
Has anyone used the new Tamron 70-300mm Di VC USD and had any issues.This lens is high on my current wishlist. Have seen a number of posts regarding the issue with AF in liveview with 3 rd party lenses especially Sigma